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Horizon3.ai hits $2 billion valuation in $250 million funding round

Horizon3.ai announced a $250 million Series E funding round at a valuation exceeding $2 billion, tripling its previous $650 million valuation from its Series D round just over a year ago. The oversubscribed round was co-led by existing investors NightDragon and NEA, with participation from seven new investors and five returning backers, underscoring accelerating global demand for autonomous security validation as AI-driven cyberattacks escalate.

read1 min views1 publishedAug 3, 2026

Horizon3.ai has announced a $250 million Series E at a valuation of more than $2 billion, tripling its valuation from $650 million at Series D in just over a year. The oversubscribed round was co-led by existing investors NightDragon and NEA, with participation from seven new investors and five returning backers. The capital underscores accelerating global demand for safe, autonomous security validation as AI-driven cyberattacks escalate. “We invented the concept of AI Hackers and spent … More

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